You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.0 KiB
87 lines
3.0 KiB
// Copyright (c) 2016 Google Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef TOOLS_IO_H_
|
|
#define TOOLS_IO_H_
|
|
|
|
#include <cstdint>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
#include <vector>
|
|
|
|
// Appends the content from the file named as |filename| to |data|, assuming
|
|
// each element in the file is of type |T|. The file is opened with the given
|
|
// |mode|. If |filename| is nullptr or "-", reads from the standard input, but
|
|
// reopened with the given mode. If any error occurs, writes error messages to
|
|
// standard error and returns false.
|
|
template <typename T>
|
|
bool ReadFile(const char* filename, const char* mode, std::vector<T>* data) {
|
|
const int buf_size = 1024;
|
|
const bool use_file = filename && strcmp("-", filename);
|
|
if (FILE* fp =
|
|
(use_file ? fopen(filename, mode) : freopen(nullptr, mode, stdin))) {
|
|
T buf[buf_size];
|
|
while (size_t len = fread(buf, sizeof(T), buf_size, fp)) {
|
|
data->insert(data->end(), buf, buf + len);
|
|
}
|
|
if (ftell(fp) == -1L) {
|
|
if (ferror(fp)) {
|
|
fprintf(stderr, "error: error reading file '%s'\n", filename);
|
|
if (use_file) fclose(fp);
|
|
return false;
|
|
}
|
|
} else {
|
|
if (sizeof(T) != 1 && (ftell(fp) % sizeof(T))) {
|
|
fprintf(
|
|
stderr,
|
|
"error: file size should be a multiple of %zd; file '%s' corrupt\n",
|
|
sizeof(T), filename);
|
|
if (use_file) fclose(fp);
|
|
return false;
|
|
}
|
|
}
|
|
if (use_file) fclose(fp);
|
|
} else {
|
|
fprintf(stderr, "error: file does not exist '%s'\n", filename);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Writes the given |data| into the file named as |filename| using the given
|
|
// |mode|, assuming |data| is an array of |count| elements of type |T|. If
|
|
// |filename| is nullptr or "-", writes to standard output. If any error occurs,
|
|
// returns false and outputs error message to standard error.
|
|
template <typename T>
|
|
bool WriteFile(const char* filename, const char* mode, const T* data,
|
|
size_t count) {
|
|
const bool use_stdout =
|
|
!filename || (filename[0] == '-' && filename[1] == '\0');
|
|
if (FILE* fp = (use_stdout ? stdout : fopen(filename, mode))) {
|
|
size_t written = fwrite(data, sizeof(T), count, fp);
|
|
if (count != written) {
|
|
fprintf(stderr, "error: could not write to file '%s'\n", filename);
|
|
if (!use_stdout) fclose(fp);
|
|
return false;
|
|
}
|
|
if (!use_stdout) fclose(fp);
|
|
} else {
|
|
fprintf(stderr, "error: could not open file '%s'\n", filename);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
#endif // TOOLS_IO_H_
|